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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 564 · 40 sums
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The method (Know the totals): Acute < 90°, right = 90°, obtuse between 90° and 180°, straight = 180°. On a straight line: the two angles add up to 180°. In a triangle: the three angles add up to 180°. Around a point: 360°. Clock: each hour mark is 30° apart (360° ÷ 12).

NameDateTime takenScore ___ / 40
  1. 1.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  2. 2.Two angles of a triangle are 60° and 95°. What is the third angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 40° and 25°. What is the third angle (in degrees)?
  5. 5.Two angles of a triangle are 85° and 90°. What is the third angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 80° and 45°. What is the third angle (in degrees)?
  8. 8.An angle measures 145°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  9. 9.An angle measures 40°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  10. 10.An angle measures 20°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  11. 11.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 60° and 65°. What is the third angle (in degrees)?
  13. 13.An angle measures 135°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  14. 14.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  15. 15.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  16. 16.An angle measures 55°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  17. 17.Two angles of a triangle are 25° and 35°. What is the third angle (in degrees)?
  18. 18.Two angles of a triangle are 75° and 30°. What is the third angle (in degrees)?
  19. 19.Two angles of a triangle are 85° and 55°. What is the third angle (in degrees)?
  20. 20.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  21. 21.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  22. 22.An angle measures 85°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  23. 23.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  24. 24.Two angles of a triangle are 20° and 50°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 90° and 70°. What is the third angle (in degrees)?
  26. 26.Two angles of a triangle are 70° and 35°. What is the third angle (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  28. 28.An angle measures 75°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  29. 29.An angle measures 25°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  30. 30.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  32. 32.An angle measures 180°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  33. 33.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  35. 35.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 80° and 120°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 70° and 20°. What is the third angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 55° and 30°. What is the third angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?

Answer key

  1. 140
  2. 25
  3. 20
  4. 115
  5. 5
  6. 170
  7. 55
  8. Obtuse
  9. Acute
  10. Acute
  11. 60
  12. 55
  13. Obtuse
  14. 20
  15. 90
  16. Acute
  17. 120
  18. 75
  19. 40
  20. Right
  21. 60
  22. Acute
  23. 135
  24. 110
  25. 20
  26. 75
  27. 70
  28. Acute
  29. Acute
  30. 150
  31. 40
  32. Straight
  33. 115
  34. 150
  35. 125
  36. 160
  37. 90
  38. 80
  39. 95
  40. 60

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